ex_to_yaniv.cpp

#include <iostream>
#include <math.h>
using namespace std;

int convertibaseto10(int Num, int ibase)
{
	int tmp1 = Num;
  	int decimal = 0;
	int ex = 0;
	while ( tmp1 >= 1)
	{
		decimal += (tmp1 % 10)*pow(ibase, ex);
		ex++;
		tmp1 = tmp1 / 10;
	}
	return decimal;
}

void convert10tofbase(int tmp1, int fbase)
{
	int arr[10] = { 0 };
	int i = 0;
  
	while (tmp1 >= 1)
	{
		arr[i] = tmp1 % fbase;
		i++;
		tmp1 = tmp1 / fbase;
	}
	for (i = 9; i >= 0; i--)
        if (arr[i] > -1 )
		  cout << arr[i];
    
}

int convertNum(int input_num,int ibase, int fbase)
{
	if (ibase < 2 || ibase>10)
	{
		cout << "Problem with input!" << endl;
		return 0;
	}
	int tmp = input_num;
	while (tmp >= 1)
	{
		if (tmp % 10 >= ibase) 
		{
			cout << "Problem with input!" << endl;
			return 0;
		}
		else
      tmp = tmp / 10;
	}
	int newnum = convertibaseto10(input_num, ibase);
	convert10tofbase(newnum,fbase);
}


int main()
{
  int input_num, ibase, fbase;
  cout << "Enter number:";
  cin >> input_num;
  cout << "Enter input base:";
  cin >> ibase;
  cout << "Enter output base:";
  cin >> fbase;
  convertNum(input_num,ibase,fbase);
}